<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Demo3</title>
    <style>
        td{
            border:1px solid;
            <!--使用css来加上边框,后面的solid是代表实线的意思-->
        }
    </style>
</head>
<body>
<script>
    document.write("<table align='center'>");
    var i;var j;
    for(i=1;i<=9;i++)
    {
        document.write("<tr>");
        for(j=1;j<=i;j++)
        {
            document.write("<td>");
            document.write(i+"*"+j+"="+i*j+" ");
            document.write("</td>");
        }
        document.write("</tr>");
    }
    document.write("</table>");
</script>
</body>
</html>